JP2011247077A - Column beam joint structure, column end joint structure and column base joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column beam joint structure, a column end joint structure or a column base joint structure capable of sufficiently securing the bearing force of a column beam joint part, a column end part or a column base part.SOLUTION: In the column beam joint structure, the column end joint structure or the column base joint structure, a base plate 23 welded to the flange 21 of a beam end part 20, the column end part or the column base part is provided on the end face of the beam end part 20, the column end part or the column base part of a steel structure, the base plate 23 is fixed to the side face of the column joint part 10 of a concrete structure, the upper surface or lower surface of a beam joint part or the upper surface of a foundation part, and thus the beam end part 20, the column end part or the column base part is joined to the side face of the column joint part 10, the upper surface or lower surface of the beam joint part or the upper surface of the foundation part. A reinforcing plate 3 projected more to the outer side in a flange width direction than the side edge of a flange 21 at least is welded to the flange 21, and the reinforcing plate 3 is welded to the base plate 23.

Description

  The present invention relates to a column beam joining structure in which a steel beam end is joined to a concrete column joint, a column end joining structure in which a steel column end is joined to a concrete beam joint, and concrete. The present invention relates to a column base joint structure in which a steel column base is joined to a steel foundation.

  In recent years, as a beam-to-column connection structure that joins a steel beam end to a concrete column joint, development of a connection structure that joins the column end to the column joint using a base plate and anchor bolts has been underway. . The above-mentioned pillars are through pillars, and anchor bolts are fixed to the joints of the pillars. Further, a base plate is welded to the beam end portion described above, and this base plate is fixed to the side surface of the column joint portion with the anchor bolt described above.

  Further, conventionally, for example, a beam-to-column connection structure in which a steel beam end is connected to a joint portion of a steel pipe column as shown in Patent Document 1 below is known. This column beam connection structure has a configuration in which a plate-like diaphragm is welded to the outer peripheral surface of a column connection portion, and a beam end portion is bolted to this diaphragm. According to this column beam connection structure, the beam end portion is widened by the diaphragm, so that the proof stress of the column beam connection structure can be improved.

  Conventionally, as a column base joint structure that joins a column base to a concrete foundation, etc., a structure in which a base plate is generally welded to the lower end surface of a column material, and the base plate is fixed to the upper surface of the base portion with an anchor bolt. It has been known. By the way, in view of the damage of the steel column base in the event of a large earthquake, in recent years, when designing the above-described column base joint structure, for example, as described in Non-Patent Document 1 below, In addition to the base plate design and anchor bolt design according to the stress and the stress at the time of retained strength, there are items for determining whether the anchor bolt has an extension capability and whether the column base retains the horizontal strength joint. Is required to do. For example, when the bending strength of the column base is less than α (for example, 1.1 in the case of 490N class) times less than the bending strength of the column material, the position of the plastic hinge during bending deformation due to an earthquake or the like is the lower end surface of the column material Therefore, it is necessary to confirm the retained horizontal proof stress by increasing the structural characteristic coefficient of the first floor by 0.05%, for example. Further, when the anchor bolt does not have the ability to extend, it is necessary to secure the retained horizontal proof stress on the first floor under the condition that the member type is lowered to the D rank regardless of the rank of the pillar.

JP 2001-262699 A

“Fiscal 2007 Structural Technical Standards for Buildings, National Gazette Sales Cooperative, August 10, 2007, p. 597-p. 604”

  However, the conventional beam-column joint structure using the base plate and the anchor bolt has a problem that it is difficult to ensure the proof strength of the beam-column joint. In other words, the yield strength is determined by the volume and strength of concrete that can be considered as a joint, but the beam width and flange thickness at the beam end are small at the beam-column joint, and the volume of concrete that can be considered as a joint is sufficient. Therefore, it is difficult to ensure the above yield strength. In addition, even if it is a column base junction part mentioned above, the volume of the concrete which can be considered as a junction part may not be enough, and it may be difficult to ensure the said proof stress similarly to a column beam junction structure. The same applies to a columnar joint structure in which the base plate and anchor bolts are used to join the lower surface of the beam, such as a structure in which the columnar column heads are joined.

  In addition, in the above-described conventional joint structure of the column base using the base plate and the anchor bolt, the bending strength of the column base is often less than or equal to α times the bending strength of the column material. Since it is necessary to check the retained horizontal proof stress by increasing the characteristic coefficient, the number of steel frames in the entire superstructure increases, the number of connecting members such as base plates and anchor bolts increases, and the number of foundation frames increases There is a problem that the cost increases. In the same way, it is necessary to increase the structural characteristic coefficient of the top floor and confirm the retained horizontal strength of the top floor in the above-mentioned column head joint structure as well. Since it becomes a plastic hinge at the time of deformation, it is necessary to check the retained strength by increasing the structural characteristic coefficient in the same manner as the column base joint structure.

  The present invention takes the above-described conventional problems into consideration, and can sufficiently ensure the proof strength of the column beam joint, the column end joint, and the column base joint, and the beam end, the column end, An object of the present invention is to provide a column beam joint structure, a column end joint structure, and a column base joint structure capable of confirming the holding strength without increasing the structural characteristic coefficient of the column base.

  In the column beam connection structure according to the present invention, a base plate welded to a flange of the beam end portion is provided on the end surface of the steel beam end portion, and the base plate is fixed to the side surface of the concrete column joint portion. Thus, in the beam-to-column connection structure in which the beam end portion is bonded to the side surface of the column connection portion, a reinforcement plate protruding at least outward in the beam width direction from the side edge of the flange is welded to the flange. The reinforcing plate is welded to the base plate.

Due to these features, the beam width dimension of the joint to the column joint at the beam end is greater than the flange width by the amount of the reinforcing plate that protrudes outside the side edge of the flange in the beam width direction (flange width direction). As a result, the volume of concrete that can be considered as a joint is increased.
Also, the bending strength of the beam end is greater than the bending strength of the beam material, and the position of the plastic hinge of the beam is the end of the reinforcing plate on the center side of the beam (the end opposite to the end welded to the base plate) It becomes a structure where the beam material yields in advance.

  Further, in the column end joint structure according to the present invention, a base plate welded to a flange of the column end is provided on an end surface of the steel column end, and the base plate is an upper surface of a concrete beam joint. Alternatively, in the column end joint structure in which the column end portion is bonded to the upper surface or the lower surface of the beam joint portion by being fixed to the lower surface, the flange is at least on the outer side in the flange width direction than the side edge of the flange. The protruding reinforcing plate is welded, and the reinforcing plate is welded to the base plate.

Due to such a feature, the column width dimension of the joint portion with respect to the beam joint at the column end is wider than the flange width by the amount of the reinforcing plate protruding outward in the flange width direction from the side edge of the flange. As a result, the volume of concrete that can be considered as a joint increases.
Also, the bending strength of the column end is greater than the bending strength of the column material, and the position of the plastic hinge of the column is the end of the reinforcing plate on the center side of the column (the end opposite to the end welded to the base plate) It becomes the position of, and it becomes a structure where the pillar material yields in advance.

  In the column base joint structure according to the present invention, a base plate welded to a flange of the column base is provided on the lower end surface of the steel column base, and the base plate is provided on the top surface of the concrete base. By fixing, in the column base joint structure in which the column base is joined to the upper surface of the foundation, a reinforcing plate protruding at least outward in the flange width direction from the side edge of the flange is welded to the flange. The reinforcing plate is welded to the base plate.

With such a feature, the column width dimension of the joint portion with respect to the base portion of the column base is widened more than the flange width by the amount of the reinforcing plate protruding outward in the flange width direction from the side edge of the flange. The volume of concrete that can be considered as a joint increases.
Further, the bending strength of the column base is larger than the bending strength of the column material, the position of the plastic hinge of the column becomes the position of the upper end portion of the reinforcing plate, and the column material yields in advance.

  By the way, as the above-mentioned reinforcing plate, it is possible to use a side plate disposed substantially flush with the flange on the side of the flange. In this side plate, partial penetration welding or the like is performed on the side edge of the flange. Therefore, a high level of welding skill is required.

Therefore, in the column beam connection structure according to the present invention, the reinforcing plate is made of a plate member having a rectangular shape in plan view superimposed on the surface of the flange, and the width dimension of the reinforcing plate is larger than the width dimension of the flange. It is preferable that both side portions of the reinforcing plate protrude outward in the beam width direction from the side edges of the flange.
Further, in the column end joint structure according to the present invention, the reinforcing plate is made of a plate material having a rectangular shape in plan view superimposed on the surface of the flange, and the width dimension of the reinforcing plate is larger than the width dimension of the flange. It is preferable that both side portions of the reinforcing plate protrude outward in the flange width direction from the side edges of the flange.
In the column base joint structure according to the present invention, the reinforcing plate is made of a plate material having a rectangular shape in plan view superimposed on the surface of the flange, and the width dimension of the reinforcing plate is larger than the width dimension of the flange. It is preferable that both side portions of the reinforcing plate protrude outward in the flange width direction from the side edges of the flange.
Thereby, for example, since the reinforcing plate is welded to the flange by a simple welding operation such as fillet welding, a welding operation requiring a high skill such as partial penetration welding is unnecessary. The above-mentioned “width dimension of the reinforcing plate” is a dimension in the flange width direction, and “a width dimension of the reinforcing plate” in the column-to-column connection structure is a dimension in a direction perpendicular to the beam axis direction. The “width dimension of the reinforcing plate” in the joint structure and the column base joint structure is a dimension in a direction perpendicular to the column axis direction.

Furthermore, in the beam-column joint structure according to the present invention, a notch extending in the beam axis direction is formed in the reinforcing plate, and an edge of the notch and a surface of the flange are welded to the fillet to strengthen the reinforcement. It is preferable that the plate and the flange are joined.
Further, in the column end joint structure according to the present invention, a notch extending in the column axis direction is formed in the reinforcing plate, and an edge portion of the notch and a surface of the flange are welded to the fillet so that the reinforcement is performed. It is preferable that the plate and the flange are joined.
Further, in the column base joint structure according to the present invention, a notch extending in the column axis direction is formed in the reinforcing plate, and an edge portion of the notch and a surface of the flange are welded to fillet. It is preferable that the plate and the flange are joined.
Thereby, the welding length of a reinforcement plate and a flange is fully ensured, and a reinforcement plate and a flange are joined firmly.

  According to the column beam joint structure, the column end joint structure, and the column base joint structure according to the present invention, the volume of concrete that can be considered as the joint portion is increased. Therefore, the column beam joint, the column end joint, and the column base joint structure Sufficient yield strength can be ensured. Also, since the bending strength of beam ends, column ends, and column bases is greater than the bending strength of beam materials and column materials, design without increasing the required holding strength of beam ends, column ends, and column bases. be able to.

It is a perspective view of the column beam junction structure for explaining the 1st embodiment of the present invention. It is a perspective view of the beam-column joining structure for demonstrating the 2nd Embodiment of this invention. It is a perspective view of the column end junction structure for demonstrating the 3rd Embodiment of this invention. It is a perspective view of the column end junction structure for demonstrating the 4th Embodiment of this invention. It is a perspective view of the column end junction structure for demonstrating the 5th Embodiment of this invention. It is a perspective view of the column end junction structure for demonstrating the 6th Embodiment of this invention.

  Hereinafter, embodiments of the beam-column joint structure according to the present invention (first and second embodiments), embodiments of the column end joint structure according to the present invention (third and fourth embodiments), Embodiments (fifth and sixth embodiments) of the column base joint structure according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, a first embodiment of a column beam joint structure according to the present invention will be described with reference to FIG.
The column-beam joint structure shown in FIG. 1 is a structure in which a steel-structured large beam 2 is joined to a column 1 made of concrete (such as reinforced concrete or steel-reinforced concrete).

  The pillar 1 is a prismatic through pillar extending over a plurality of floors, and the upper-floor pillar portion 11 and the lower-floor pillar portion 12 are integrally connected via the pillar joint portion 10. Yes. A plurality of anchor bolts 13 are provided in the aforementioned column joint portion 10. The plurality of anchor bolts 13 are embedded and fixed in the concrete of the column joint portion 10, and the tip portion protrudes perpendicularly from the side surface of the column joint portion 10. The nuts 14 are respectively screwed. The plurality of anchor bolts 13 are arranged in accordance with positions of bolt holes (not shown) of the base plate 23 described later.

  The large beam 2 is a steel beam made of H-shaped steel. A side plate 3 (reinforcing plate) that widens the beam end portion 20 is provided at the end portion of the large beam 2 (beam end portion 20). The side plate 3 is a plate material welded to the upper and lower flanges 21, 21 of the beam end portion 20, and protrudes outward in the beam width direction from the side edge 21 a of the flange 21. More specifically, the side plate 3 is made of a flat steel plate and is disposed on the side of the flange 21 of the beam end 20. Further, the side plates 3 and 3 on both sides are arranged on the same plane with respect to the flange 21, and the surfaces of the side plate 3 and the flange 21 are flush with each other.

  Further, the side plate 3 is formed in a right trapezoidal shape, and the parallel opposite sides 3a and 3b extend along the beam axis direction, and the right angle portion faces the beam axis direction outer side (the column joint portion 10 side). Arranged. That is, of the parallel sides of the side plate 3, the longer side (long side edge 3a) is arranged on the inner side in the beam width direction (flange 21 side), and the shorter side (short side edge 3b) is in the beam width direction. Arranged outside. The long side edge 3 a is partially welded to the side edge 21 a of the flange 21 of the beam end portion 20. Further, among the opposite sides of the side plate 3 that are not parallel, the side (right end edge 3c) that is perpendicular to the parallel opposite sides 3a and 3b is on the outer side in the beam axis direction (on the column joint portion 10 side). The hypotenuse (slope end edge 3d) that is arranged and is inclined with respect to the parallel opposite sides 3a and 3b described above is arranged inside the beam axis direction. The straight edge 3c is formed on the same line as the edge 21b of the flange 21 on the outer side in the beam axis direction.

  Further, the above-described beam end portion 20 is joined to the side surface of the column joint portion 10. More specifically, a base plate 23 arranged perpendicular to the flange 21 is provided on the end surface of the beam end portion 20. The base plate 23 is made of a rectangular steel plate, and is disposed on the outer side in the beam axis direction of the end edges 21 b and 21 b of the upper and lower flanges 21 and 21, and is disposed along the side surface of the column joint portion 10. . The base plate 23 is butt welded to the end edge 21b of the flange 21 and the right end edges 3c, 3c of the side plates 3, 3 on both sides. The welded portion of the base plate 23, the flange 21, and the side plates 3, 3 continues from the straight edge 3 c of one side plate 3 to the straight edge 3 c of the other side plate 3 through the edge 21 b of the flange 21. Welded.

  A plurality of bolt holes (not shown) are formed in the upper and lower portions of the base plate 23, respectively. The plurality of bolt holes formed in the upper part of the base plate 23 are arranged in parallel along the upper side of the base plate 23, and the plurality of bolt holes formed in the lower part of the base plate 23 are arranged in parallel along the lower side of the base plate 23. Has been. The above-described anchor bolts 13 are inserted into the plurality of bolt holes, and the base plate 23 is fastened to the anchor bolts 13 by nuts 14 screwed to the anchor bolts 13.

  According to the beam-to-column connection structure having the above-described configuration, the side plate in which the beam width dimension B1 of the beam end portion 20 to the column joint portion 10 protrudes outward in the beam width direction from the side edge 21a of the flange 21. It is wider than the flange width B2 by 3 and 3. That is, the sum of the flange width B2 and the width dimensions B3 and B3 of the side plates 3 and 3 on both sides is the beam width dimension B1 of the joint portion of the beam end 20 to the column joint 10. As a result, the volume of the concrete of the column joint portion 10 that can be considered as a joint portion increases by the amount widened as described above (the amount of the side plates 3 and 3 on both sides). Therefore, it is possible to sufficiently ensure the proof stress of the column beam joint.

  Moreover, according to the column beam connection structure which consists of an above-described structure, the bending strength of the beam end becomes larger than the bending strength of the steel frame material of the large beam 2 by the side plates 3 and 3, and the position of the plastic hinge of the large beam 2 is shown in FIG. As shown by a one-dot chain line L in FIG. 1, it becomes the position of the end portion (corner portion of the long side edge 3a and the oblique end edge 3d) of the side plate 3, 3 at the beam center side. It becomes a structure that yields ahead. Thereby, it is possible to confirm the retained strength of the superstructure without increasing the structural characteristic coefficient. As a result, it is possible to reduce the amount of steel frame of the entire upper structure, reduce the number of base plates 23 and anchor bolts 13, reduce the number of frames of the column joint 10, and reduce costs. it can.

[Second Embodiment]
Next, a second embodiment of the column beam joint structure according to the present invention will be described with reference to FIG.
In addition, about the structure similar to above-mentioned 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 2, a top plate 103 (reinforcing plate) that widens the beam end portion 20 is provided at the end portion (beam end portion 20) of the large beam 2. Specifically, the top plate 103 is made of a flat plate-shaped steel plate having a rectangular shape in plan view, and is superimposed on the surface of the flange 21 of the beam end portion 20 (the upper surface of the upper flange 21 and the lower surface of the lower flange 21). Yes. The width dimension B4 of the top plate 103 is larger than the flange width B2, and the side portions on both sides of the top plate 103 are projected outward from the side edge 21a of the flange 21 in the beam width direction.

  Further, the top plate 103 has a notch 130 cut out from an end edge 103a on the inner side in the beam axis direction (opposite side to the column fitting portion 10 side) toward the outer side in the beam axis direction (on the column fitting portion 10 side). Is formed. The notch 130 is a slit-like notch extending along the beam axis direction, and is disposed at the center portion in the beam width direction. The edges 130 a and 130 a on both sides of the notch 130 and the surface of the flange 21 are welded to the fillet, whereby the top plate 103 is joined to the flange 21.

  According to the column beam connection structure having the above-described configuration, the top plate 103 is welded to the flange 21 by fillet welding that is simpler than partial penetration welding. Therefore, welding work that requires a high level of skill such as partial penetration welding is not required, the welding skill can be reduced, and the top plate 103 can be reliably joined to the flange 21.

  Further, the notch 130 is formed in the top plate 103, and the edge portions 130a, 130a on both sides of the notch 130 and the surface of the flange 21 are welded to the fillet, so that the top plate 103 and the flange 21 are welded. Sufficient length is secured. Thereby, the top plate 103 and the flange 21 can be firmly joined, and the top plate 103 can be reliably joined to the flange 21.

  Further, in the column beam connection structure having the above-described configuration, the thickness of the top plate 103 can be appropriately changed. Therefore, if the width dimension B4 of the top plate 103 necessary for securing the strength of the joint is much larger than the flange width B2 necessary for the design of the building, it can be dealt with by reducing the thickness of the top plate 103. It is.

[Third Embodiment]
First, an embodiment of a column end joint structure according to the present invention will be described with reference to FIG.
The column end joint structure shown in FIG. 3 is a column end joint structure in which the lower end of a steel column 202 is joined to the upper surface of a beam joint portion 210 of a large beam 201 made of concrete (such as reinforced concrete or steel reinforced concrete). .

  The beam joint portion 210 is a column support portion that supports the column 202, and the beam joint portion 210 is provided with a plurality of anchor bolts 213. The plurality of anchor bolts 213 are embedded and fixed in the concrete of the beam joint portion 210, and the tip portion protrudes vertically from the upper surface of the beam joint portion 210, and the anchor bolt 213 has a tip portion. The nuts 214 are respectively screwed. The plurality of anchor bolts 213 are arranged in accordance with positions of bolt holes (not shown) of the base plate 223 described later.

  The column 202 is a steel column made of H-shaped steel, and is a column built between upper and lower beams. A side plate 203 (reinforcing plate) that widens the column lower end 220 is provided at the lower end 220 of the column 202. The side plate 203 is a plate member welded to the flanges 221 and 221 on both sides of the column lower end portion 220, and protrudes outward in the flange width direction (strong axis direction) from the side edge 221 a of the flange 221. More specifically, the side plate 203 is made of a flat steel plate and is disposed on the side of the flange 221 of the column lower end 220. Further, the side plates 203 and 203 on both sides are arranged on the same plane with respect to the flange 221, and the surfaces of the side plate 203 and the flange 221 are flush with each other.

  Further, the side plate 203 is formed in a right trapezoidal shape, and the parallel opposite sides 203a and 203b extend along the column axis direction, and the right angle portion is disposed downward. That is, of the opposite sides of the side plate 203 which are parallel to each other, the longer side (long side edge 203a) is arranged on the inner side in the flange width direction (flange 221 side), and the short side (short side edge 203b) is in the flange width direction. Arranged outside. The long side edge 203a is partially welded to the side edge 221a of the flange 221 of the column lower end 220. Of the opposite sides of the side plate 203 that are not parallel to each other, the right side (right edge 203c) that forms a right angle to the parallel opposite sides 203a and 203b is disposed on the lower side, and the parallel opposite sides 203a and 203a, The hypotenuse (slope end edge 203d) inclined with respect to 203b is arranged on the upper side. The straight edge 203c is formed on the same line as the lower edge 221b of the flange 221.

  Further, the above-described column lower end portion 220 is joined to the upper surface of the beam joint portion 210. More specifically, a base plate 223 disposed perpendicular to the flange 221 is provided on the lower end surface of the column 202. The base plate 223 is made of a rectangular steel plate, is disposed below the column lower end portion 220 and is disposed along the upper surface of the beam joint portion 210. The base plate 223 is butt welded to the lower end edge 221b of the flange 221, the lower end edge 222a of the web 222, and the straight end edges 203c, 203c of the side plates 203, 203 on both sides. The welded portion of the base plate 223, the flange 221, and the side plates 203, 203 extends from the straight edge 203c of one side plate 203 to the straight edge 203c of the other side plate 203 through the lower edge 221b of the flange 221. Welded continuously.

  The base plate 223 has a plurality of bolt holes (not shown). The plurality of bolt holes are arranged side by side in the flange width direction on both sides of the flange 221 (both sides in the weak axis direction of the column 202) in plan view. The above-described anchor bolts 213 are inserted through the plurality of bolt holes, and the base plate 223 is fastened to the anchor bolts 213 by nuts 214 screwed to the anchor bolts 213.

  According to the column end joining structure having the above-described configuration, the side plate in which the column width dimension D1 of the joining portion of the column lower end portion 220 with respect to the beam joint portion 210 protrudes outward in the flange width direction from the side edge 221a of the flange 221. It is wider than the flange width D2 by 203 and 203. That is, the sum of the flange width D2 and the width dimensions D3, D3 of the side plates 203, 203 on both sides is the column width dimension D1 of the joint portion of the column lower end portion 220 to the beam joint portion 210. As a result, the concrete volume of the beam joint portion 210 that can be considered as a joint portion is increased by the amount widened as described above (the portions of the side plates 203 on both sides). Therefore, it is possible to sufficiently ensure the yield strength of the column end joint portion.

  Further, according to the column end joint structure having the above-described configuration, the bending strength of the column base is larger than the bending strength of the steel frame of the column 202 by the side plates 203, 203, and the position of the plastic hinge of the column 202 is 3, the structure is such that the steel plate material of the column 202 yields in advance at the position of the upper end portion (corner portion of the long side edge 203 a and the oblique end edge 203 d) of the side plates 203, 203 as indicated by the one-dot chain line L It becomes. Thereby, the retained horizontal proof stress of the superstructure can be confirmed without increasing the structural characteristic coefficient. As a result, it is possible to reduce the amount of steel frame of the entire upper structure, reduce the number of base plates 223 and anchor bolts 213, reduce the number of frames of beam joints 210, and reduce costs. it can.

[Fourth Embodiment]
Next, another embodiment of the column end joint structure according to the present invention will be described with reference to FIG.
In addition, about the structure similar to above-mentioned 3rd Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 4, a top plate 303 (reinforcing plate) that widens the column lower end portion 220 is provided at the lower end portion 220 of the column 202. More specifically, the top plate 303 is made of a rectangular flat plate-shaped steel plate, and is superimposed on the surface on the outer side in the weak axis direction of the flange 221 of the column lower end portion 220 (the surface opposite to the facing surface). The width dimension D4 of the top plate 303 is larger than the flange width D2, and the side portions on both sides of the top plate 303 protrude outward from the side edge 221a of the flange 221 in the flange width direction.

  Further, the top plate 303 is formed with a notch 330 that is notched upward from the lower edge 303a. The notch 330 is a slit-like notch extending along the column axis direction, and is disposed at the center portion in the flange width direction. The edges 330 a and 330 a on both sides of the notch 330 and the surface of the flange 221 are each welded to the fillet, whereby the top plate 303 is joined to the flange 221.

  According to the column end joining structure having the above-described configuration, the top plate 303 is welded to the flange 221 by fillet welding that is simpler than partial penetration welding. Therefore, welding work that requires a high level of skill such as partial penetration welding is not required, the welding skill can be reduced, and the top plate 303 can be reliably joined to the flange 221.

  Further, a notch 330 is formed in the top plate 303, and the edges 330a, 330a on both sides of the notch 330 and the surface of the flange 221 are welded to the fillet, so that the top plate 303 and the flange 221 are welded. Sufficient length is secured. Thereby, the top plate 303 and the flange 221 can be firmly joined, and the top plate 303 can be reliably joined to the flange 221.

  Further, in the column end joint structure having the above-described configuration, the thickness of the top plate 303 can be appropriately changed. Therefore, if the width dimension D4 of the top plate 303 necessary for securing the strength of the joint is much larger than the flange width D2 required for the design of the building, it can be dealt with by reducing the thickness of the top plate 303. It is.

[Fifth Embodiment]
First, an embodiment of a column base joint structure according to the present invention will be described with reference to FIG.
The column base joint structure shown in FIG. 5 is a column base joint structure in which a column base 420 of a steel column 402 is joined to the upper surface of a foundation 401 made of concrete (such as reinforced concrete or steel reinforced concrete).

  The base portion 401 has a configuration in which a rising portion 410 having a rectangular shape in plan view protrudes from the upper surface of a hexahedral footing 411, and a concrete underground beam 412 is integrally formed on the side surface of the footing 411. A pile body 415 is suspended from the lower surface of the footing 411. A plurality of anchor bolts 413 are provided in the rising portion 410 of the base portion 401. The plurality of anchor bolts 413 are embedded and fixed in the concrete of the base portion 401, and the tip portion protrudes vertically from the upper surface of the base portion 401. A nut 414 is provided at the tip portion of the anchor bolt 413. Are respectively screwed. The plurality of anchor bolts 413 are arranged in accordance with the positions of bolt holes (not shown) of the base plate 423 described later.

  The column 402 is a steel column made of H-shaped steel. The column base 420 of the column 402 is provided with a side plate 403 (reinforcing plate) that widens the column base 420. The side plate 403 is a plate material welded to the flanges 421 and 421 on both sides of the column base 420, and protrudes outward in the flange width direction (strong axis direction) from the side edge 421a of the flange 421. More specifically, the side plate 403 is made of a flat plate-like steel plate, and is disposed on each side of the flange 421 of the column base 420. Further, the side plates 403 and 403 on both sides are arranged on the same plane with respect to the flange 421, and the surfaces of the side plate 403 and the flange 421 are flush with each other.

  Further, the side plate 403 is formed in a right trapezoidal shape, and the parallel opposite sides 403a and 403b extend along the column axis direction, and the right angle portion is disposed downward. That is, of the opposite sides of the side plate 403 that are parallel to each other, the longer side (long side edge 403a) is arranged on the inner side in the flange width direction (flange 421 side), and the short side (short side edge 403b) is in the flange width direction. Arranged outside. The long side edge 403a is partially welded to the side edge 421a of the flange 421 of the column base 420. Of the opposite sides of the side plate 403 that are not parallel to each other, the right side (right edge 403c) perpendicular to the parallel sides 403a and 403b is disposed on the lower side. The hypotenuse (slope end edge 403d) inclined with respect to 403b is arranged on the upper side. The straight end edge 403c is formed on the same line as the lower end edge 421b of the flange 421.

  Further, the column base 420 described above is joined to the upper surface of the foundation 401. More specifically, a base plate 423 arranged perpendicular to the flange 421 is provided on the lower end surface of the column 402. The base plate 423 is made of a rectangular steel plate, is disposed below the column base 420 and is disposed along the upper surface of the rising portion 410 of the base 401. The base plate 423 is butt welded to the lower end edge 421b of the flange 421, the lower end edge 422a of the web 422, and the straight end edges 403c and 403c of the side plates 403 and 403 on both sides. The welded portion of the base plate 423, the flange 421, and the side plates 403, 403 extends from the straight edge 403c of one side plate 403 to the straight edge 403c of the other side plate 403 through the lower edge 421b of the flange 421. Welded continuously.

  The base plate 423 is formed with a plurality of bolt holes (not shown). The plurality of bolt holes are arranged side by side in the flange width direction on both sides of the flange 421 (on both sides in the weak axis direction of the column 402) in plan view. The above-described anchor bolts 413 are inserted into the plurality of bolt holes, and the base plate 423 is fastened to the anchor bolts 413 by nuts 414 screwed to the anchor bolts 413.

  According to the column base joint structure having the above-described configuration, the side plate 403 having the column width dimension D1 of the joint portion of the column base 420 with respect to the base portion 401 protruding outward in the flange width direction from the side edge 421a of the flange 421, It is wider than the flange width D2 by 403. That is, the sum of the flange width D2 and the width dimensions D3, D3 of the side plates 403, 403 on both sides becomes the column width dimension D1 of the joint portion of the column base 420 to the base portion 401. As a result, the concrete volume of the base portion 401 that can be considered as a joint portion increases by the amount widened as described above (for the side plates 403 and 403 on both sides). Therefore, it is possible to sufficiently ensure the yield strength of the column base joint portion.

  In addition, according to the column base joint structure having the above-described configuration, the bending strength of the column base is greater than the bending strength of the steel frame of the column 402 by the side plates 403, 403, and the position of the plastic hinge of the column 402 is As indicated by a dashed line L in FIG. 3, the structure is such that the steel plate material of the column 402 yields in advance at the position of the upper end portion (corner portion of the long side edge 403a and the oblique end edge 403d) of the side plates 403, 403. It becomes. Thereby, the retained horizontal proof stress of the first floor can be confirmed without increasing the structural characteristic coefficient of the first floor (the lowest floor where the column base 420 is present). As a result, it is possible to reduce the amount of steel frame of the entire upper structure, reduce the number of base plates 423 and anchor bolts 413, reduce the number of frames of the base portion 401, and reduce costs.

[Sixth Embodiment]
Next, another embodiment of the column base joint structure according to the present invention will be described with reference to FIG.
In addition, about the structure similar to above-mentioned 5th Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 6, the column base 420 of the column 402 is provided with a top plate 503 (reinforcing plate) that widens the column base 420. More specifically, the top plate 503 is made of a rectangular plate-shaped steel plate, and is superimposed on the surface on the outer side in the weak axis direction of the flange 421 of the column base 420 (the surface on the opposite side of the facing surface). The width dimension D4 of the top plate 503 is larger than the flange width D2, and the side portions on both sides of the top plate 503 project outward from the side edge 421a of the flange 421 in the flange width direction.

  Further, the top plate 503 is formed with a notch 530 that is notched upward from the lower edge 503a. This notch 530 is a slit-like notch extending along the column axis direction, and is disposed at the center portion in the flange width direction. The edges 530 a and 530 a on both sides of the notch 530 and the surface of the flange 421 are welded to the fillet, whereby the top plate 503 is joined to the flange 421.

  According to the column-base joining structure having the above-described configuration, the top plate 503 is welded to the flange 421 by fillet welding that is simpler than partial penetration welding. Therefore, a welding operation that requires a high level of skill such as partial penetration welding is unnecessary, the welding skill can be reduced, and the top plate 503 can be reliably joined to the flange 421.

  Further, a notch 530 is formed in the top plate 503, and the edge portions 530a and 530a on both sides of the notch 530 and the surface of the flange 421 are respectively welded to the fillet, so that the top plate 503 and the flange 421 are welded. Sufficient length is secured. Thereby, the top plate 503 and the flange 421 can be firmly joined, and the top plate 503 can be reliably joined to the flange 421.

  Further, in the column base joint structure having the above-described configuration, the thickness of the top plate 503 can be appropriately changed. Therefore, when the width dimension D4 of the top plate 503 necessary for securing the strength of the joint is much larger than the flange width D2 necessary for the design of the building, it can be dealt with by reducing the thickness of the top plate 503. It is.

The embodiments of the column beam joint structure, the column end joint structure, and the column base joint structure according to the present invention have been described above, but the present invention is not limited to the above embodiments and does not depart from the spirit thereof. The range can be changed as appropriate.
For example, in the first and second embodiments described above, the reinforcing plates such as the side plates 3 and 3 and the top plate 103 are welded to the upper and lower flanges 21 and 21 of the beam end portion 20, respectively. In the third and fourth embodiments, the reinforcing plates of the side plates 203 and 203 and the top plate 303 are welded to the flanges 221 and 221 on both sides of the column lower end portion 220, respectively. In this embodiment, the reinforcing plates of the side plates 403 and 403 and the top plate 503 are welded to the flanges 421 and 421 on both sides of the column base 420, respectively, but in the present invention, either one of the flanges 21 (221 and 421) is used. The structure which welded the reinforcement plate only to ()) may be sufficient.

  In the above-described embodiment, the right side trapezoidal side plate 3 (203, 403) and the rectangular top plate 103 (303, 503) are welded to the flange 21 (221, 421). The shape of the reinforcing plate can be changed as appropriate. For example, it may be a rectangular or right triangle side plate, or may be a trapezoidal top plate.

  In the embodiment described above, the base plate 23 (223, 423) is welded perpendicular to the flange 21 (221, 421). However, in the present invention, the base plate is disposed perpendicular to the flange. Alternatively, the base plate may be welded obliquely to the flange. In other words, the base plate only needs to be arranged in a direction intersecting with the flange. For example, in the case of a beam end portion having a gradient or an inclined flange, the flange is a column end. In this case, the base plate is disposed in an obliquely inclined direction with respect to the flange, and is disposed along the side surface of the column joint portion. In addition, in the case of a column bottom with a slope or a column bottom having a slanted flange, the flange is inclined with respect to the top surface of the beam joint. Are arranged in an obliquely inclined direction, and are arranged along the upper surface of the beam joint portion. Further, in the case of a column base with a slope or an inclined flange, since the flange is inclined with respect to the upper surface of the foundation, the base plate is inclined with respect to the flange. And is disposed along the upper surface of the base portion.

  Moreover, although the pillar 1 in the above-described first and second embodiments is a through pillar extending over a plurality of floors, the column beam connection structure in the present invention is not limited to the through pillar. Absent. For example, the column joint portion in the present invention may be a column joint portion on the top floor (roof floor), or when the positions of the upper and lower floor columns are shifted, It may be a column joint at the lower end.

  In the third and fourth embodiments described above, the column lower end portion 220 is joined to the upper surface of the beam joint portion 210. However, the column end joint structure of the present invention has an upper end portion (column head). ) May be joined to the lower surface of the beam joint, and for example, the above-described upper end of the stud may be joined to the lower surface of the beam joint.

  In the first and second embodiments described above, the column beam connection structure for bonding the large beam 2 made of H-section steel to the column 1 is described. In addition, the third and fourth embodiments described above are described. In the embodiment, the column end joining structure for joining the column 202 made of H-shaped steel to the beam joint portion 210 is described, and in the fifth and sixth embodiments, the column made of H-shaped steel is described. Although the column-base joining structure for joining the column base 420 of the base 402 to the base portion 401 is described, the beam in the column-beam joining structure of the present invention is not limited to a beam made of H-shaped steel. The column in the column end joint structure and the column base joint structure of the present invention is not limited to a column made of H-shaped steel, but a column of another structure. Also good. For example, it may be a steel beam or a steel column made of channel steel, T-shaped steel, I-shaped steel or the like. Further, it may be a parallel chord truss beam (lattice beam) or a strip plate beam in which an upper flange material made of angle steel or the like and a lower flange material are connected by a web material such as flat steel, or made of angle steel. It may be a parallel string truss column (lattice column) or a strip plate column in which a pair of flange members are connected by a web material such as flat steel. Further, it may be a box beam in which the upper ends and lower ends of grooved steel, lattice beam, strip plate beam, etc. arranged in parallel are connected by a connecting material such as flat steel, etc., and arranged in parallel. It may be a box-shaped column in which flange members such as a grooved steel, a lattice column, and a strip plate column are connected to each other by a connecting material such as a flat steel. The beam in the column beam joint structure of the present invention may be a concrete-coated steel beam in which a part or all of the steel beam is coated with concrete, and the column end joint structure and the column base joint structure of the present invention. The column may be a concrete-coated steel column in which concrete is coated on a part or all of the steel column, or a concrete-filled steel tube column in which concrete is filled inside the steel tube column.

  In the second, fourth, and sixth embodiments described above, the top plate 103 (303, 503) is formed with the notches 130 (330, 530). However, in the present invention, the notch 130 ( 330, 530) may be the top plate 103 (303, 503). In this case, the top plate 103 (303, 503) is welded to the end of the top plate 103 (303, 503) on the inner side in the beam axis direction (column axis direction) and the surface of the flange 21 (221, 421). Can be joined to the flange 21 (221, 421).

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

1, 202, 402 Column 2, 201 Large beam (beam)
3, 203, 403 Side plate (reinforcement plate)
10 Column connection part 20 Beam end part 21,221,421 Flange 23,223,423 Base plate 103,303,503 Top plate (reinforcement plate)
130, 330, 530 Notch 210 Beam joint part 220 Column lower end (column end)
401 Foundation 420 Column base

Claims (9)

A base plate welded to a flange of the beam end portion is provided on an end surface of the steel beam end portion, and the base plate is fixed to a side surface of the concrete column connection portion, thereby the column connection portion. In the column-beam joint structure in which the beam end is joined to the side surface of
The flange is welded to at least a reinforcing plate protruding outward in the beam width direction from the side edge of the flange,
A column beam connection structure, wherein the reinforcing plate is welded to the base plate. In the beam-column joint structure according to claim 1,
The reinforcing plate is made of a plate material having a rectangular shape in plan view superimposed on the surface of the flange,
A beam-column joint structure characterized in that a width dimension of the reinforcing plate is larger than a width dimension of the flange, and both side portions of the reinforcing plate are projected outward in the beam width direction from the side edges of the flange. . In the beam-column joint structure according to claim 2,
A notch extending in the beam axis direction is formed in the reinforcing plate,
A beam-column joining structure, wherein an edge of the notch and a surface of the flange are fillet welded to join the reinforcing plate and the flange. A base plate welded to the flange of the column end portion is provided on the end surface of the steel column end portion, and the base plate is fixed to the upper surface or the lower surface of the concrete beam joint portion so that the beam finishing is performed. In the column end bonding structure in which the column end is bonded to the upper surface or the lower surface of the mouth,
The flange is welded to at least a reinforcing plate protruding outward in the flange width direction from the side edge of the flange,
A column end joining structure, wherein the reinforcing plate is welded to the base plate. In the column end junction structure according to claim 4,
The reinforcing plate is made of a plate material having a rectangular shape in plan view superimposed on the surface of the flange,
Column end joining structure characterized in that the width dimension of the reinforcing plate is larger than the width dimension of the flange, and both side portions of the reinforcing plate are projected outward in the flange width direction from the side edges of the flange, respectively. . In the column end joint structure according to claim 5,
In the reinforcing plate, a notch extending in the column axis direction is formed,
A column end joining structure, wherein an edge of the notch and a surface of the flange are fillet welded to join the reinforcing plate and the flange. A base plate welded to the flange of the column base is provided on the lower end surface of the steel column base, and the base plate is fixed to the upper surface of the concrete base so that the base plate In the column base joint structure in which the column base is joined,
The flange is welded to at least a reinforcing plate protruding outward in the flange width direction from the side edge of the flange,
A column base joining structure, wherein the reinforcing plate is welded to the base plate. In the column base junction structure according to claim 7,
The reinforcing plate is made of a plate material having a rectangular shape in plan view superimposed on the surface of the flange,
A column base joint structure characterized in that the width dimension of the reinforcing plate is larger than the width dimension of the flange, and both side portions of the reinforcing plate are projected outward in the flange width direction from the side edges of the flange, respectively. . In the column base junction structure according to claim 8,
In the reinforcing plate, a notch extending in the column axis direction is formed,
A column base joining structure, wherein an edge of the notch and a surface of the flange are fillet welded to join the reinforcing plate and the flange.

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